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Chi Draconis (χ Dra, χ Draconis, Chi Draconis) is a star system in the constellation Draco.

χ Draconis
Location of χ Draconis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 18h 21m 03.38255s[1]
Declination +72° 43′ 58.2518″[1]
Apparent magnitude (V) 3.570[2] (3.68 / 5.67)
Characteristics
Spectral type F7V[3] / K0V
U−B color index -0.06
B−V color index 0.49
Variable type Suspected
Astrometry
Radial velocity (Rv)+32.4[2] km/s
Proper motion (μ) RA: 531.21[1] mas/yr
Dec.: -349.71[1] mas/yr
Parallax (π)124.11 ± 0.87 mas[1]
Distance26.3 ± 0.2 ly
(8.06 ± 0.06 pc)
Absolute magnitude (MV)4.04[2]
Orbit[4]
CompanionChi Draconis B
Period (P)0.7680599 ± 0.000061 yr
Semi-major axis (a)0.1244 ± 0.0011″
Eccentricity (e)0.428 ± 0.012
Inclination (i)74.42 ± 0.58°
Longitude of the node (Ω)230.30 ± 0.51°
Periastron epoch (T)1984.8324 ± 0.0026
Argument of periastron (ω)
(secondary)		119.3 ± 1.1°
Details
χ Dra A
Mass1.029 ± 0.026[5] M☉
Radius1.20 ± 0.09[5] R☉
Luminosity1.86[5] L☉
Temperature6,150 ± 150[5] K
Metallicity [Fe/H]−0.41[2] dex
Rotational velocity (v sin i)11[6] km/s
Age5.3[2] Gyr
χ Dra B
Mass0.748 ± 0.017[5] M☉
Radius0.73 ± 0.11[5] R☉
Luminosity0.29[5] L☉
Temperature4,940 ± 200[5] K
Other designations
χ Dra, 44 Dra, BD+72° 839, FK5 695, Gl 713, HD 170153, HIP 89937, HR 6927, LHS 3379, LTT 15438, SAO 9087.[3]
Database references
SIMBADdata

Description


χ Draconis in optical light
χ Draconis in optical light

The first companion is a yellow-white (class F) fourth-magnitude star with a mass approximately equal to that of the sun, but it is nearly twice as luminous. The second companion is an orange (class K) sixth-magnitude star, that is less massive and of lesser luminosity than the sun. In 1898 this system was reported to be a spectroscopic binary system, with an orbital period of 280.55 days. The two stars have an average separation of nearly an astronomical unit, which would disrupt the orbit of any Earth-like planet that was close enough to the primary to support liquid water. The two stars have less than half the abundance of heavy elements as the Sun and are approximately a billion years older.[2] Separations between the two stars have been measured[4][7] and the difference in brightness between the two stars is 2.12 magnitudes at 700 nm.[7]


See also



References


  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621
  3. "chi Dra -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-10-15
  4. Farrington, C. D.; et al. (June 2010), "Separated Fringe Packet Observations with the CHARA Array. I. Methods and New Orbits for χ Draconis, HD 184467, and HD 198084", The Astronomical Journal, 139 (6): 2308–2318, Bibcode:2010AJ....139.2308F, doi:10.1088/0004-6256/139/6/2308
  5. Torres, G.; Andersen, J.; Giménez, A. (2010), "Accurate masses and radii of normal stars: modern results and applications", The Astronomy and Astrophysics Review, 18 (1–2): 67–126, arXiv:0908.2624, Bibcode:2010A&ARv..18...67T, doi:10.1007/s00159-009-0025-1, S2CID 14006009 See p. 56, entry #15.
  6. Monin, D. N.; Fabrika, S. N.; Valyavin, G. G. (2002). "Magnetic survey of bright northern main sequence stars". Astronomy & Astrophysics. 396 (1): 131–141. Bibcode:2002A&A...396..131M. doi:10.1051/0004-6361:20021425.
  7. Hutter, D. J.; Zavala, R. T.; Tycner, C.; Benson, J. A.; Hummel, C. A.; Sanborn, J.; Franz, O. G.; Johnston, K. J. (9 November 2016). "Surveying the Bright Stars by Optical Interferometry. I. A Search for Multiplicity Among Stars of Spectral Types F-K". The Astrophysical Journal Supplement Series. 227 (1): 4. arXiv:1609.05254. Bibcode:2016ApJS..227....4H. doi:10.3847/0067-0049/227/1/4. S2CID 118803592.



На других языках

- [en] Chi Draconis

[es] Ji Draconis

Ji Draconis o Chi Draconis (χ Dra / 44 Draconis / HD 170153)[1] es un sistema estelar en la constelación de Draco de magnitud aparente +3,55. Ocasionalmente recibe el nombre de Batentaban Borealis, proveniente del árabe بطن الثعبان baţn al-thubān, cuyo significado es «la panza del dragón». Se encuentra relativamente próximo al Sistema Solar, a sólo 26,3 años luz de distancia.

[ru] Хи Дракона

Хи Дракона (χ Draconis) — двойная звезда в созвездии Дракона на расстоянии около 26,3 световых лет от нас.


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